Help w/ AE software, rough idle and shutoff

[1duallyman]

First post! Let me say thanks to all who post relavent information here. I have found the search function and hours of reading to be very helpfull.

I drive a

99 f350 dually, crew cab, 8' bed,4x4, 7.3L, auto, lariat fully loaded
It runs a snow plow with 6" of lift and 35" tires. No mods to the motor except maybe a chip from the old owner. Heavyduty trans cooler and fan, trans by-pass line/ck valve delete.

It started giving a intermitent irregular ( surging ) idle a few months ago, folowed by a service engine light, cold starting problems, and then engine stalling while idling( hot and cold) and then stalling/ restarting while driving.

After alot of reading on here I decided to buy the AE scanner to help me diagnose this diesel. I figure I have more then one problem causing these symptoms.

So after playing with AE here's what I have. When I pulled the codes I had P1211,P0603,P0113,P1280
So I looked at the wiring for the intake air sensor and found a break in the wire, after repairing the break in the wire, I cleared the codes.

Injector buzz test sounded fine.
1280 code is still showing
ICP is showing from.01 volts to .05 volts depending on engine speed
ICP pressure shows 724.03 at idle
ICP duty cycle at 14.45% at idle

When I ran the KOER test and the Cyl. contribution test I got a code P1284 ICP failure and the test stopped.

All my wiring looks OK.

I checked the ICP sensor and it has alot of oil in the connector, that should be a sign of a bad sensor?

Should I be able to disconnect the ICP sensor and have the system ignore it so I can see if that improves the problems?

It sounds like IPR valve is bad? Is there any other tests or items to check before I replace it? Where is a good place to buy it from?




Thanks for any help you can give me.

[dusted4eva]

Sounds like the Cam Shaft Positioning Sensor.

[slayerf250]

Oil leaking frrom the ICP is the sign that it is bad......replace ICP then retest, if IPR is sticking/failing you would have a "below normal" IPR duty cycle reading.....